Screw-swaging machine



m B 9 h S w. e G h S 3 S an d 0 M 0 W SCREW SWAGING MACHINE.

Patent'ed Jul 3 1883.

In van Z07" N. PEI'ERS. PhakrL'rtIwgnphM. Wahingmn, n. c.

(No Model.) 3 Sheets-Sheet 2.

S. A. DAVIS & R. BLAKE.

SCREW SWAGING MACHINE. 4

: No. 280,723. tented July 3, 1883.

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3 Sheets-Sheet 3.

s. A. DAVIS & R.;BLAKE.

SCREW SWAGING MACHINE 'Jizvn for.

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UNITED STATES PATE T FFICE.

STEPHEN A. DAVIS AND ROBERT BLAKE, OF N EWVARK, NEW JERSEY.

SCREW-SWAGING MACHINE.

SPECIFICATION forming part of Letters.Patent No. 280,723, dated July 3,1883.

' Application filed December 9, 1889. (No model.)

To all whom it may concern:

Be it known that we, STEPHEN A. DAVIS and ROBERT BLAKE, citizens of theUnited States, both residing at Newark, in the county of Essex and Stateof New Jersey, have invented certain new and useful Improvements inScrew-Swaging Machines, of which the following is a description in suchfull, clear, concise, and exact terms as to enable any one skilled inthe art to which it appertains or with which it is most nearlyconnectedto make and use the same, reference being had to the accompanyingdrawings, making part of this specification, and to the figures andletters of reference marked thereon' Reference being had to saiddrawings, Figurel is a side elevation of a machine embracing andincluding our invention; Fig. 2, afront elevation thereof, and Fig. 3atop View, Figs. 4, 5, and 6 being parts in detail, as will behereinafter more fully explained.

The construction and operation of this machine will be understood fromthe following description,tl1e points of novelty being pointed out inthe claims concluding this specification.

Similar letters of reference represent corresponding parts of thedifferent figures of the drawings.

The frame is shown by A, upon the side of which a cam-shaft, e, isplaced, and supported in suitable journal-'bearing, J, and upon' the topof said frame a main driving-shaft, B, is placed, carried in thejournal-bearing K, said shaft being fitted with a fast and loose pulley,O and O, and also a bevel-wheel, D, by which the power is applied todrive the machine.

In front of the frame a spindle, E, is set in the journal-bearing K.Upon this spindle a bevel-wheel, N, is placed to gear into the wheel D,by which the spindle is made to rotate about its own axis. This spindlehas not only a ro-. tating motion, but it has also a vertical motion inthe line of its axis. The upward mo tion of this spindle is impartedtoit by ascrewthread, L, working in a half-nut, B. This halfnut isoperated by means of a lever, Q,

l and a cam, Q, on the shaft 6, and aspring, Q,

connecting the lever to a pin in the frame, the nut being pressedforward by the action of the cam upon the lever, and held against thethread L until the time comes'for the spindle to fall, when the camreleases the lever and the spring Q draws it back, disengaging the nutand leaving the spindle to fall, as shown by Fig. 6; but to overcome thefriction of the machinery on the spindle and to make it fall promptly, ayokelever, F, is applied to its top by means of a grooved collar, G.This lever is fulcrumed at i, and has a roller, i, in its opposite end,acting against a cam, H, by which the spindle is not only made to fallpromptly and quickly, but is the head of the screw by means of a groovedcollar, 0, operated by means of a forked lever, 0, the opposite end ofwhich works in the cam P, the cam operating to force the end of thelever up and the collar down upon the The chuck, and to hold it thereuntil the time comes to release the screw. The cam then releases thelong end of the lever, and the spring 1' draws up the collar, releasingthe chuck,

which in its turn is forced open by means of a spring placed in thespindle between the jawsof the chuck. This springis not shown in thedrawings, but may be of any suitable construction adapted tothe work.

Fixed to the frame of the machine, and centered directly under the axisof the spindle, a die-box, U, is placed, inclosing a set ofswaging-dies. A horizontal sectional view of this die-box and the diesis shown by 4. upon an enlarged scale. The box consists of a ring, U,made to reciprocate about its own axis by means of a cam, U, on theshafte, acting" against an arm, U, and bya spring, U, the cam throwingthe ring forward and the spring pulling it back the moment the arm isreleased by the cam. The swaging dies consist of rollers b, the edges ofwhich are made in the 'form desired to swage the required style ofthread on the screw. These dies are set in blocks of steel 0, mortisedin a disk of metal and radiating from the center or axis of the box. Theinner ends of these blocks of steel carry the roller-dies upon suitablepivots or center bearings, and their outer ends are sloped, cam like,all in one direction, and against each of them a cam set screw, j, isplaced through the ring U. By these means it will. be seen that when thecam U strikes the arm U all of the die-blocks I) are pressed forward bythe screws j upon the screw-blank to be swaged; but the moment the camreleases the arm the springU draws the arm back, releasing the blocksb,which in their turn are forced apart by the springs 71, acting againsta projection, V, on the side of each of the blocks in the manner shown.The spring a is an auxiliary spring to assist the spring U in movingback the ring U, as described.

Directly under the center of the die-box and the axis of the spindle Eis placed a receivingsocket, \V. This socket is supported upon a lever,Y, and is guided by the sleeve X. It has an upward motion imparted to itby means of a spring, Z, and a downward motion imparted to it by meansof a cam, 11, through the lever Y, fulcrumed at a.

Directly under the die box, and in close proximity to the top of thesocket W, a leader, 0, is set, coming from a hopper. (Not shown in thedrawings.) The object of this leader is to carry the screw-blanks c fromthe hopper to the socket IV, by which they are fed into the machine, ablank dropping into the top of the socket every time it is drawn down bythe cam, the jar of the machine at every rotation of the cam beingsufficient to shake one of the blanks oil of the leader into the socket.All of the rotating cams, it will be seen, are placed on the shaft 0,and the motion is transmitted to this shalt by means of a worm-screw, M,acting upon a worm-wheel, S, and a bevelwheel placed on the shaft I, togear into a con responding wheel on the shaft (1, the worm M beingcarried by the hub K of the wheel N.

The operation is as follows: The cam 1?. draws down the socket IV, ascrew-blank, 0, drops into it. At that instant the dies are opened bythe spring U. The spring Z then draws the socket up, carryingthe-screw-blank be tween the dies. The spindle then falls by the actionof the cam H, and the chuck T and screw-driver f grip the head of thescrew. The dies then close by the action of the cam U, and the nut R ismoved forward by the cam Q and engages the thread L. The spindle riseswith a left hand rotating motion, forming the thread on the screw T asit rises and backs out of the die. The screw is then released from thechuck by the action of the cam I and spring r, and drops into a smallpan, not shown in the drawings,) by which it is removed and succeeded byanother blank, as before.

In the operation. 01' the machine the spring Z performs two functions.It not only draws the socket XV up to the die, but also permits it toyield to the spindle in its downward motion in case the screw-blank is atrifle too long, thus allowing the screw-driver to find its hold in thenick of the screw-head without danger of breaking it or tearing the headof the screw.

In the construction of the above-described machine the gearing-wheelsare proportioned with reference to each other, so as to cause thespindle to make about thirty-six revolutions to one of the cam-shaft;but this proportion of speed may be modified as circumstances mayrequire.

\Ve claim and desire to secure by Letters Patent 1. In a screw-swagingmachine, the combination of spindle E, having a chuck, T, and collars Gand O, and a rotating and reciprocating motion, a set of swagingdies, I)b 0, having an opening and closing motion, a feedingsocket, \V, having areciprocating motion, a cam-shaft, (1, having a rotating motion, andfitted with cams I-I, Q, P, U, and d, a set of cam connecting andoperating levers, F, Q, 0, U, and Y, a set of retractile springs, U Z r,a connecting-nut, It, a driving-shalt and pulleys, B O, a pair ofgear-wheels, N I), a c011- necting-sha'lt, I, between the spindle andcamshaft, fitted with a worm-wheel, S, acting into a worm, M, anda"bevel-wheel gearing into a corresponding wheel. on the cam-shaft, allof the several parts being supported upon a suitable frame, A, and madeto coaet substantially as described.

2. In a screw-swaging machine, the combination of a set of opening andclosing rotating swagingdies, b b I), a feeding-socket, \V, asupportinglever, Y, a rotating cam, (I, and a spring, Z, the severalparts coacting substantially as described.

3. In a screw-swaging machine, the combination of a set of opening andclosing rotating swaging-dies, a spindle fitted with a screwdriver andchuck, a rotating cam, I, and a lever, 0, connecting the chuck and cam,the several parts coacting substantially as de scribed.

4. In a screw-swaging machine, a set of retating swaging-dies, I) I) I),set in metal cambloeks I) I) b, radiating from a common center, combinedwith springs l1, and inclosed in a reciprocating ring fitted withcam-screws j j j, the several parts coacting. substantially asdescribed.

5. I11 a screw-swaging machine, the combination of a rotating cam, Q, aspindle, 1+], having a screw-thread, L, cut in its periphery, a nut, R,to open and close on the thread, a lever, Q, and spring Q, to operatethe nut, the whole coacting substantially as described.

6. In a screw-swaging machine, the combination of a gravitating spindle,E, having a groove-collar, G, a rotating ea1n,I-I,a connecting-lever F,a half-nut, R, and a screw, L, and the several parts eoacting with therotatthe several parts coaeting substantially as de ing sWaging-dies,substantially as described. 10 scribed, for the purpose specified.STEPHEN A DAVIS- 7. In a screw-swagin machine the eombi- I nation of acam-shaft, eta screw-Holding spin ROBT' A dle, E, a eonneeting shaft,Laworni-wheel, S, Witnesses: and a worm, M, working 011 the spindle E,the .S. GROVER OROWELL,

shafts I and e being'fitted with gear-Wheels, I. A. KING.

